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Nearly full spin polarization of the surface state on a topological insulator | Z.-H. Pan
; E. Vescovo
; A. V. Fedorov
; D. Gardner
; Y.S. Lee
; S. Chu
; G. D. Gu
; T. Valla
; | Date: |
28 Jan 2011 | Abstract: | We performed high resolution spin- and angle-resolved photoemission
spectroscopy studies of the electronic structure and the spin texture on the
surface of Bi$_2$Se$_3$, a model topological insulator. By tunning the photon
energy, we found that the topological surface state is well separated from the
bulk states in the vicinity of $k_z=Z$ plane of the bulk Brillouin zone. The
spin-resolved measurements in that region indicate a very high degree of spin
polarization of the surface state, $sim 0.75$, much higher than previously
reported. Our results demonstrate that the topological surface state on
Bi$_2$Se$_3$ is highly spin polarized and that the dominant factors limiting
the polarization are mainly extrinsic. | Source: | arXiv, 1101.5615 | Services: | Forum | Review | PDF | Favorites |
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